如何使用Alamofire更改全局变量?

时间:2019-05-03 18:27:53

标签: ios swift uitableview closures alamofire

我想使用Alamofire获取用户数据并将其填充到tableView中。

我的代码:

class MainTableViewController: UITableViewController {
    var userEntries = [UserEntries]()

    override func viewDidLoad() {
        super.viewDidLoad()

        fetchUserData { (ue) in
            print("ue.count is: \(ue.count)")
            self.userEntries = ue
            print("self.userEntries.count in this block: \(self.userEntries.count)")
        }

        print("self.userEntries.count in viewDidLoad is: \(self.userEntries.count)")
    }

    func fetchUserData(completion: @escaping ([UserEntries]) -> Void) {
        //another code...

        Alamofire.request(url, method: .post, parameters: parameters, encoding: URLEncoding(destination: .httpBody), headers: headers).responseJSON { (response) in
            switch response.result {
            case .success(let value):
                let json = JSON(value)
                let data = json["mydata"][0].array
                var userEntries = [UserEntries]()
                //I have 2 records only        
                data?.forEach({ (p) in
                    userEntries.append(UserEntries(id: p["id"].stringValue, date: p["date"].stringValue, text: p["text"].stringValue))
                })
                completion(userEntries)
            case .failure(let error):
                print(error.localizedDescription)
            }
        }
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return self.userEntries.count //it is return 0...
    }
}

在viewDidLoad中,我有以下照片:

  viewDidLoad中的

self.userEntries.count是:0 //必须为2 !!!

     

ue.count是:2

     

self.userEntries.count在此块中:2

并且在numberOfRowsInSection方法中返回0,因为

  viewDidLoad中的

self.userEntries.count是:0 //必须为2 !!!

如何正确设置'self.userEntries'变量(数组)以在tableView方法中使用它?

1 个答案:

答案 0 :(得分:1)

由于获取数据的调用是异步的,因此您需要在完成过程中重新加载表

fetchUserData { (ue) in
   print("ue.count is: \(ue.count)")
   self.userEntries = ue
   print("self.userEntries.count in this block: \(self.userEntries.count)")
   self.tableView.reloadData()
}